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From:   Daniel Baluta <daniel.baluta@gmail.com>
Date:   Mon, 13 May 2019 17:29:32 +0300
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Subject: Re: [PATCH RESEND 1/2] soc: imx: Add SCU SoC info driver support
To:     Anson Huang <anson.huang@nxp.com>
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<snip>

> +
> +static u32 imx8qxp_soc_revision(void)
> +{
> +       struct imx_sc_msg_misc_get_soc_id msg;
> +       struct imx_sc_rpc_msg *hdr = &msg.hdr;
> +       u32 rev = 0;
> +       int ret;
> +
> +       hdr->ver = IMX_SC_RPC_VERSION;
> +       hdr->svc = IMX_SC_RPC_SVC_MISC;
> +       hdr->func = IMX_SC_MISC_FUNC_GET_CONTROL;
> +       hdr->size = 3;
> +
> +       msg.data.send.control = IMX_SC_C_ID;
> +       msg.data.send.resource = IMX_SC_R_SYSTEM;
> +
> +       ret = imx_scu_call_rpc(soc_ipc_handle, &msg, true);
> +       if (ret) {
> +               dev_err(&imx_scu_soc_pdev->dev,
> +                       "get soc info failed, ret %d\n", ret);
> +               return rev;

So you return 0 (rev  = 0) here in case of error? This doesn't seem
to be right. Maybe return ret?